gauge cluster light went dim.

03 ram 1500, 4.7 mag. fuel, alternator light in gauge cluster, heat-A/C control light went dim. checked ground related wiring to dimmer. Also heater blows hot through the 3 right vents, but cold through the 2 on the drivers side.

I had a pioneer stereo,amp,subs,viper alarm, keyless remote entry installed. don`t know if that has anything to do with it.dimmer works. all ground wires or wiring seem to be secure, as are all fuses